Automatically controlled oil burning system



2, 1934- 1 A. HILKEN 1,975,423- AUTOMATICALLY CONTROLLED OIL BURNINGSYSTEM" Filed Nov. 13,- 1931 ve NTQ A Patented Oct. 2, 1934 i Mfr-BNOFFICE AUTOMATICALLY CONTROLLED on. BURNING S TEM -f" Alfred fiilke nGeneva, Switzerland, assigno r to I p firm: Ateliers H.,Cuenod, S. A.,Geneva,"Swit-'- jjzerland" Q Application November 13, 1931, Serial No.574,909 1 v In Switzerland October. 9, 19 31 t a w I g I te m. I,(oi-rsszsy v I I This invention relatesto an automajticzillycoritrolledby a thermostatplaced in the boiler and trolled oil burning system ofthe type of those destined-to prevent overheatingof this latter."comprising an electric motor which actuates'a The receptacle 13is fedwith oil, at thesame pump sending the-oil to the burner andwhichistimegas the burner, by. the pump 2, owing to the placed underthedependency of twothermostats pipe 14; thisjreceptacle is providedwith an empty- 50 of whichthe one puts' the motor out'of action oring'orifice lfi normally closed by a valve 16 which in action accordingto a given temperature of a; spring 1'7 tends to maintain raised andwhich the room to be heated beingattained ornot, while an electro-'magnet ,18 app1ies to its seating; the

the second, cooperating with a commutator, 'perwinding of thiselectromagnet' is branched to the mitsto start the motor and to stop itat the end mains '5 and'fi in series with thes'witches 7 and 65 of apredetermined period if the oil does not burn. 12. A floating bulb 19 isconnected to one end Usually in installations of this type, the conof alever 19a mounted rotatably on the receptacle tacts of the commutatorare controlled by a ro- 13 and of which the other end carries a switchtatable member which turns under the influence member 20.

of a horological mechanism and which during its This latter whichcooperates with the thermal 70 rotation acts on the contacts at givenmoments. stack switch 8, is constituted by a three-pole One has alsorealized devices provided with elecmercury tube 21 and a two-polemercury tube tromagnets having a dashpot and cooperating 22, and ofwhich the one, the tube 22, is des- With bimetallic blades Capable beingted; tined to connect one of the terminals of the motor the more or lessretarded movement of these 1 to the contact piece 10 of the switch 8,while 75.

blades is used to actuate the contacts in the dethe other 21, isdestined to connect the same sired moment. terminal to the contact piece11 of the said But all this apparatus is complicated and of switch. Themobile contact 9 of this latter is a delicate nature which increases thecost of the branched in series with the boiler switch 12 and 25installation and renders its operation less sure. room thermal switch '7to the conductor 5 while 80' The Present invention has for its object toremove the second terminal of the motor 1 is connected theseinconveniences and consists in the providirectly to the conductor 6.sion of an electric control mechanism for oil 23 is a transformer ofwhich the primary is burners in which a suitable switch member, 00- putin shunt with the motor 1, and can be put operating with a thermal stackswitch sensitive in circuit by the mercury tube 21, while the 85 tocombustion conditions for controlling the secondary serves to bring toincandescence an motor circuit, is connected to a float mechanism,ignition spiral 24 placed in the burner in proxcapable upon movement ofthe float caused by imity to oil discharge orifices. The Fig. 1 showsfuel accumulation due to operation of the fuel the mechanism at themoment of starting operapump, of actuating said switch member. tion ofthe burner. The switches '7 and 12 are 90 The accompanying drawingrepresents by way closed and the current, starting from the conofexample and diagrammatically one embodicluctor 6, flows to the motor, tothe two contacts ment of the present invention. of the mercury tube 22,to the contact piece 10 Fig. l is a diagrammatic view of the installaandthe mobile arm 9 of the switch 8 and to the "40 tion, at the moment ofthe starting of the motor. two switches 7 and 12 to come back to thecon- 95 Fig. 2 is a similar view, at normal operation. ductor 5; theprimary of the transformer 23 is An electric motor 1 actuates a pump 2;this put in circuit by the mercury tube 21. It results latter draws oilfrom a reservoir, not shown, by therefrom that the pump 2 starts to turnand the tube 3, to send it to the burner by the tube 4. sends oil to theburner which is ignited while The electric supply mains 5 and 6 furnishcurrent coming in contact with the spiral 24. On the 100 for operatingthe motor 1. A switch '7 is conother hand, the switches 7 and 12 beingclosed, trolled by a regulating thermostat placed in the theelectromagnet 18 applies the valve 16 on its room to be heated, and athermal switch 8 is conseat; the oil which the pump sends into theretrolled by a thermostat disposed in the stack or ceptacle raisestherefore slowly the floating bulb;

" at another point of the course of the hot comat a given moment, thefloat as it rises rocks the bustion gases and its mobile part 9 stays inconmercury tubes which take the position shown tact with the contactpiece 10 as long as the oil in Fig. 2.

does not burn, to come into contact with the con- During this time theheat developed by the tact piece 11 when the oil burns and hassuflicombustion has acted on the thermostat con- 5 5 ciently heated thestack. A switch 12 is controlling the switch 8 of which the switch arm 9no comes to the contact piece 11. The motor 1 is from now on connected,by means of the mercury tube 21, the contact piece 11 and the mobile arm9 of the switch 8, to the switches 7 and 12 and the conductor 5 of themains; the transformer v23 has been put out ofcircuit owi to themovement of the mercury tube 21; When the oil sent to the burner is notignited, the switch 8 does not enter into action and its arm 9 will stayon the contact 10 after the switch member 20 has been brought into the;position shown in Fig. 2; the motor 1 will then be put out of circuitand the oil will'cease to be sent to the burner. It will be seen fromthe drawing that almost immediately after the float 19 commences to risethe mercury will flow in the tube 21 so as to conhand pole of the tubes21, 22. The two contacts 10,11 and switch arm 9 are so formedthat theswitch arm 9 touches the contact 11 before it entirely leaves thecontact 10, a suitable interval being thus affordedfor efiectingignition of' the fuel, and interruption of the motorjcircuit' is avoidedwhile the switch arm 9 changes its position. The receptacle 13 will beprovided with a, suitable overflow 25 to maintain a constant oil levelduring normal operation of the burner.

When the desired temperature is attained in overheated.

I claim:

In combination, an electrically actuating fuel feeding means, anignition means, a temperature controlled stack switch having a firstcontact which is closed in the absence of combustion and a secondcontact which is closed in the presence of combustion prior to theopening of the first contact, a main control switch, and a timing switchmechanism operable to simultaneously open first contacts and closesecond contacts a time period after the initiation :of fuel feed, astaring circuit including the main switch, the first, contact of the stackswitch, the first con tacts of the timing switch mechanism in serieswith the fuelfeeding and ignition means; connected in parallel and arunning circuit including the main switch, the second contact of thestack switch, the second contacts of the timing. switch mechanism, andthe fuel feeding, means in series.

. ALFRED HILKEN. I

